I've never encountered this before. A friend put a 350 in his '63 Nova wagon, vortec heads, GM HOT cam, Air Gap, 670 Holley, headers, you know, nice street engine. The engine would fire but not stay running. He had me re-check the valve adjustment. We verified TDC. It will start and run for about one second, sometimes spitting a tiny bit thorough the carb when it dies. The only thing I don't like is the fact he had to run a few new ignition wires because of years of "electrical engineers" improving the original harness! And the fact he has a ProComp distributor. He moved the timing around to no avail. Any ideas?:thumbsup: